依据大量的实际观测数据和实践结论,对影响急斜煤层顶煤可放性的地质因素进行了分类,采用样本主成分分析法对这些因素进行了分析,并应用Matlab对所得数据进行了处理,得出了急斜煤层顶煤可放性的评判函数．最后,按照第一主成分,给出了顶煤可放性分类指标,为此类煤层的开采实践提供了参考依据．图1,表4,参6． Based on a large number of actual observation data and practical conclusions, the geological factors that affect the caving of top coal in steep coal seam are classified. Principal component analysis (PCA) is used to analyze these factors and the data are processed by Matlab. The judgment function of the coal releasability of steep coal seam is obtained. Finally, according to the first principal component, the index of top coal releasability classification is given, which provides a reference for the mining practice of this kind of coal seam. Figure 1, Table 4, reference 6.